While my inner Tolkien geek would have liked to see Azog in the film (if he really was the character from Tolkien's books), from the point of view of making the best possible adaptations and films, it makes much more sense to have Bolg. I was slightly (not very) concerned that no casting of Bolg had been announced, although I really didn't think it was very likely that they were going to admit the character (any more than I thought they would admit Dain before Billy Connolly was finally confirmed). After all, Bolg is a tailor-made cinematic bad guy; no need to invent a Lurtz when we have him.

Thanks for cluing us in! 'But very bright were the stars upon the margin of the world, when at times the clouds about the West were drawn aside.'